bq. Don’t be surprised if missing that cup of morning coffee gives you a headache or makes it difficult to concentrate at work. It’s all part of caffeine withdrawal, say Johns Hopkins University researchers who released a study that could result in the official classification of the condition as a mental disorder.

This isn’t news; everyone I know already knows about caffeine withdrawl headaches, and I know of several hospitals that now give patients caffeine either right before or right after surgery, to prevent withdrawl symptoms from interfering with their post-op recovery…